AirHint found the following cheapest return flights from Chicago (MDW) to Buenos Aires (EZE) in December 2025 (see full year).

Return flights

11 Dec - 15 Dec	Delta
06 Dec - 07 Dec	Delta
17 Dec - 07 Jan	Delta
15 Dec - 06 Jan	Delta
10 Dec - 05 Jan	Delta
27 Dec - 10 Jan	Delta
15 Dec - 05 Jan	Delta
14 Dec - 05 Jan	Delta
26 Dec - 05 Jan	Delta
24 Dec - 03 Jan	LATAM Airlines Group
19 Dec - 03 Jan	LATAM Airlines Group

Also check the deals for one-way flights from Chicago to Buenos Aires in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from Chicago to Buenos Aires in December from 1110€

Return flights